Aldehyde base and process for the manufacture of same



Patented Sept. 22, 1931 I i g UNITED STATES ATENT OFF-ICE CHARLES uANhiIcILor BERLIN-sa'mmrz, GERMANY ALDE BASE AND P3001355 F03 THE MANUFACTURE OF SAME No Drawing. Application filed March 27, 1930, Serial No. 489,589, and in Germany. June 25, 1928.. It has been found that aldehydes of the genis a colorless oil boiling at 82 C. and 88 mm. eral formula pressure. The reaction is as follows:

where R and R represent hydrogen, alkyl' Formaldehyde \OH' 55 radicals, a hydroaromatic ring of the gen- Isobu l Dlmeth lamlne eral formuIaCnH n, or compounds splitting e off such aldehydes, may be condensed with CHI w formaldehyde and primary or secondary ali- .HOI+2H.|O

phatic amines to form ammo-aldehydes ac- 1 1 cording to the following equat1on:- ,gfi ggl figggfi g y oaono+aono+mwm= c Z e Ewample 2 The reaction proceeds favorably, if the hyo5 drochloride of the amine with the aldeh de 595 Parts by i isbutyta-ldehyde and an excess of formaldehyde in conczan- 752 Harts by'welght of llethylamme trated alcoholic solution are boiled for some chlonde 315 Parts by welght, of paraformal" time. Upon cooling the hydrochloride of the dehyde and P by welght absolute new aldehyde base generally crystallizes from alcohol are 9 hfimrs E a 70 the reaction product. The free aldehyde flux condenser whlle StHIrmg y bases separated from the salts with solution of Then 5 315 Parts y Welght 0f p r formpotassium hydroxide are colorless liquids with atldeh e are added and the ng 0011- a strong alkaline reaction, which in vacuo tmue for 4 hours under llx con enser.

5 may be distilled without decomposition. Hereafter water is added, small quantities of 7,

They are insoluble in water and very stable. mfutral substances are mmfwed y treatment With mineral acids they form crystalline salts wltih ether and the 3 y 'fi'f y which are readily soluble in water. By rcpy qq y a rl s 011-, s paduction the aldehyde bases are easily transrated y addltlon all 9110888 Qf c0ncen-- formed into the respective alkaminesi trated P of Potassmm yd The 80 The aldehyde bases are to be used as startbase bolls between 75 and 177 C. Its hying materials for the manufacture of medidfoclllolide is y hygroscopic- The t1on is as follows:

cines. g

Ew'ample 1 cm 85 17 parts by weight of isobutyl-aldehyde 16 B'H'OHO'H'O'WN Holparts'by weight of dimethylamine hy olsobllmb methmmm chloride, 8 parts by weight of absolute alcoaldehy e hydrochloride hol and 9 parts by weight of paraformalde- 0m cm hyde are boiled for an hour under a reflux condenser while stirring vigorously. Then no 9 parts by weight of paraformaldehyde are V e ,ammethyhmem again added and the reaction product is boiled pr wl-alde y y roehlonae foranother hour while stirring. The mix- E l 3 y 6 ture gradually becomes homogeneous withthe I exception of an undissolved remnant of para- 20 P t x Welght y y 24 formaldehyde. When-cooling a thick c'rysparts by welght of plperidme, 8 parts by tal mass is obtained which consists of a, aweight of absolute alcohol and 6 parts by dimethyl- B dimethyl amino prophyl-aldewei ht of paraformaldehyde are boiled for hyde hydrochloride. The free aldehyde base hal an hour under a reflux condenser while stirring vigorously. Then again by cohol are boiled for 3 to 4 hours under a reweight of paraformaldehyde are ded and flux condenser. After some heating two laythe reaction product is kept boiling for 3 hours, until only a little paraformaldeh de remains undissolved. The reaction p uct is dissolved in water and in order to remove the excess of isobutyl-aldehyde' shaken with ether. After additlon of solution of potassium hydroxide the aldehyde base separates from the mixture; it distills at 95 C. and 12 mm, pressure. The a, m-dimethyl-fl-piperidino-propyl-aldehyde is a colorless oil with a strong basic odor, which does not'mix with water. The hydrochloride of the base or stallizes beautifully from acetone and me ts at 164 C. The reaction is:

CHI 0H! H0 Formaldehyde Isobu 1 prop! aldehyde.

v Example 1,

ers are formed; by continued boiling and repeated shaking the upper layer gradually dissolves into the lower layer. When the oil swimming on the surface has completely dis- -appeared,the product is filtered and the acid liquid treated with ether. The ether absorbs but little of the product. By the addition of an excess of solution of potassium hydroxide the aldehyde base, of oily consistency, is separated, taken up with ether and distilled in vacuo. The 1-(piperidino-methyl)-hexahydro-benzaldehyde boils at 141-142 G. and 12 mm. pressure and is a colorless oil. The hydrochloride of the aldehyde base crystallizes beautifully from acetone and melts at 165 C. The reaction is:

CHr-CH: tn. $111 n.ono.mo+m( 11130]:

H Formaldehyde H:- H;

Pl rldlne H hydi'lichlorlde |Na compo Ed ll u ahyd u o robenialdehyde 15 parts by weight of isovaleryl-aldehyde,

21 parts by weight of dimethylamine liydrochloride, 25 parts by weight of formaldehyde solution (35%) are boiled for 3 hours under a reflux condenser, until the mixture has become homogeneous. The mixture, being of acid reaction, is shaken with ether; then an excess of solution of. potassium hydroxide is added and by shaking with ether 20 parts by weight of a liquid base, a-isopropyl-B-dimethyl-amino-propyl-aldehyde, are obtained. It distills in form of a water-clear oil between 66 and 68 C. at 12 mm; pressure. The salts are hygroscopic. By reducing with sodium amalgam the respective alcohol base is easily obtained, which is an oil boiling at 86 C.

and 15 mm. pressure. The reaction is: on. on, on.

n (in, +n.ono.mo+nn H0 Formaldehyde Isovaleryl aldehyde Dlmeth lamlne hydroc lorlde 011' OH! OH:

. ho yl-l-dlmethylamlno-propyl m m mammal-me.

40 parts by weight of piperidine hydrochlo-.

ride, 0.75 parts by weight of concentrated hydrochloric acid and 12 parts by weightof a1- methyl) -isobutyl-aldehyde. This raw prodnet is sufiiciently ure. In slightly acid solut1on it may be re need with sodium amalgam to the res ective alcohol base, a-(methylaminomet yl) dsobutyl-alcohol. The latter can be purified by distillation in vacuo,

whereby it distills at 85 C. and 12 mm. pressure. The distilled-alcohol base soon forms crystals, which are easily soluble in organic solvents and may be recrystallized from petroleum ether. Their melting point is 54 C.

Example 7 hydrochloride, 300 parts by weight of formaldehyde solution (35%), 200 parts by weight of water and 1 part by weight of concentrated hydrochloric acid are boiled. under a reflux condenser, until the layer of melted para-isobutyl-aldehyde swimming on the surface has almost disappeared; this requires several hours boi1ing. When cool remnants of paraisobutyl-aldehyde are removed by shaking the acid liquid with ether and hereafter the aldehyde base is separated by the addition of concentrated solution of potassium hydroxide. The base boils at 145 C. at ordinary pressure. The reaction is as follows:

Ewample 8 7 parts by weight of dimethylamine hydro chloride, 10 parts by weight of water, 12 parts by weight of isobutyl-a1dehyde-acetal and 15 parts by wei ht of formaldehyde solution (35%) are boi ed under a reflux condenser for 10 hours. The layer of acetal, which at first swims on the surface, will then have dissolved. By treating the acid solution with ether small quantities of neutral substances are removed and then the aldehyde base, a, adimethyl-;8- dimethylamino-propyl-aldehyde, is separated by the addition of an excess of concentrated solution of potassium hydroxide. The base boils between 142 and 144 C. The hydrochloride melts at 152-153. C. The reaction 18 i 11 parts by weight of diethylamine hydrochloride, 10 parts by weight of water, 12 parts by weight of isobutyl-aldehydeacetal and 15 parts by weight of formalde- E'zmmple 10 11 parts by weight of diethylamine hydrochloride, 5 parts by weightof water, 17 parts by weight of hexahydro-benzaldehyde-acetal and 12 parts by weight of formaldehyde solution (35%) are boiled for 10 hours under a reflux condenser while stirring vigorously. By treating the acid solution with ether neutral substances are removed, then solution of potassium hydroxide is added until alkaline reaction sets in, the basic products are takenup with ether and 'fractionally distilled in vacuo. The l-(diethylamino-methyl) -hexahydro-benzaldehyde distills at 120-122 CL and 12 mm. pressure. a

I claim:

1. As new product a, a-dimethyl-fl-diethylamino-propyl-aldehyde, which is produced by treating isobutyl-aldehyde with formaldehyde and diethylamin'e, the new product being a colorless oil and boiling between 175177 0., its hydrochloride being very hygroscopic. v

2. Process for the manufacture of aldehyde bases, which consists in condensing aldehydes of the general formula R CH.OHO, R

on'.orro,

wherein Rand R denote hydrogen, alkyl radicals, or together form a hydro-benzene ring, with formaldehyde and aliphatic amines other than tertiary.

4. Process for the manufacture of aldehyde bases, which consists in condensing the acetals of the aldehydes of the general formula wherein R and R denote hydrogen, alkyl radicals, or together form a hydro-benzene ring, with formaldehyde and aliphatic amines other than tertiary.

5. Process for the manufacture of aldehyde bases, which consists in condensing alde hydes of the general formula R on.ono,

' wherein R and R denote hydrogen, alkyl radicals, or together form a hydro-benzene ring, with para-formaldehyde and aliphatic amines other than tertiary.

6. Process for the manufacture of aldehyde bases, which consists in condensing aldehydes of the general formula wherein and R denote hydrogen, alkyl radicals, or together form a hydro-benzene 4' amen ring, with formaldehyde and primary aliphatic amines.

7. Process for the manufacture of aldeh de bases, which consists in condensinga dehydes of the general formula wherein R and R denote hydrogen, alkyl radicals, or together form a hydro-benzene ring, with formaldehyde and secondary aliphatic amines.

'8. Process 'for the manufacture of a, adimethyl- ,8 -diethylamino propyl aldehyde which consists in condensing lsobutyl-aldehyde with formaldehyde and diethylamine. 9. Process for the manufacture of a, adimethylp -diethylamino propyl aldehyde whichconsists in condensin ISObll l-aldehyde with paraformaldehy e and ethylamine.

10. A process for the manufacture of a1de-. hyde bases, which consists in mixing aldehydes of the general formula )cmmo wherein R and R denote hydrogen, alkyl radicals, or together form a h dre-benzene ring, with the ydrochloride 0 an all hatic amine other than tertiary, formaldehy e, and concentrated alcohol, heating said mixture, cooling the heated mlxtu whereby the hydrochloride of the aldehy e base separates, and separating the base with potassium hydroxide.

11. A new products, aldehyde bases having the general formula m a OHr-N m wherein R and R denote hydrogen, alkyl radicals, ortogether form a h dro-benzene ring, and R and R denote hy ro n, alkyl 5 radicals, or together form a plpe e rin said bases being stable, colorless liquids wit a stron allra-hne reaction, and insoluble in water; ormmg crystalline, water soluble salts with mineral acids; and being easily reduced to alkamines.

In witness whereof I have hereunto set my hand.

CHARLES MANNICH. 

